[X] My Assistant

[elakdawalla]

I'm wondering if anybody here has spent any time working on the Tempel 1 images from Deep Impact. The data are available at the Small Bodies Node (see e.g. http://pdssbn.astro.umd.edu/holdings/dif-c...0/dataset.html), and Version 2 of the PDS archive (which appears to have been published 3 years ago) includes versions of the data that have been calibrated, cleaned of instrument artifacts, and converted to units of radiance and also I/F. The HRI data have not been deconvolved to remove the blur: a bit of playing shows that without deconvolution, HRI images look pretty similar to MRI images. Attached is a color composite I made of the highest-resolution full-globe shots of Tempel 1 captured by the MRI before the impact. The image isn't big but there's more variety in color than I expected. This is made from the I/F images and is an RGB composite of red, green, and violet continuum filter images, overlaid over a clear image that I sharpened slightly. It's very red, but I think that's real.

Has anybody else worked with these?

Attached thumbnail(s)

 

[elakdawalla]

For context, here's what the raw images from Stardust at Wild 2 looked like.

http://www.planetary.org/explore/topics/as...2_stardust.html

Stardust will get slightly closer to Tempel 1, which is about double the diameter of Wild 2. So in theory we should get better pictures of Tempel 1 than we got from the MRI, but not as sharp as the ITS, and there's no color capability.

[tedstryk]

Stardust's camera is a spare Cassini WAC, so it is quite good.

I don't understand what all this attention to color is about unless we are talking about bringing out extreme minutia to study composition. Based on everything I can tell via HRI, we are dealing with something that is essentially colorless. Other than tweaking out the overall hue of the scene, I don't see much to do.

[ugordan]

I don't understand what all this attention to color is about unless we are talking about bringing out extreme minutia to study composition.

To each his own, I guess.

Based on everything I can tell via HRI, we are dealing with something that is essentially colorless. Other than tweaking out the overall hue of the scene, I don't see much to do.

It's not completely colorless uniform in color - those white patches for example stand out on this hemisphere. For me personally, simple colorizations often don't pass the sniff test in that they look more fake to me than original monochromatic data. In such cases I'd rather have the original grayscale representation.